>>11537509>light goesYour first mistake. Light doesn't "go" anywhere. It doesn't move. It reproduces/copies itself. There is therefore no "light speed" in the same way as for example a car has a speed. And the "speed" of light isn't a constant, by the way.
>reach the closest starBy that you mean reach the closest solar system, where on one of the planets orbiting said star there might be ayys. Right? And that's your second mistake. The vast majority of planets with life on them orbit within the plasma sheath of brown dwarf stars. Not like Earth around a "main sequence star" at all. And so, if you searched out so called "main sequence stars" you most likely wouldn't find any ayys. And if you went to a brown dwarf star, you wouldn't be able to encounter them either. You wouldn't see (well enough) through the plasm sheath, and they wouldn't see you. Most likely your ship wouldn't be able to penetrate through the sheath either without getting fucked up.
This misunderstanding on where life is to be found, ties in with you question:
>How could it be that we're all alone?We aren't. To put it simply, the ayys are just out of sight from us, and we're out of sight from them. Everyone's hiding from each other, from within their own little cosmic wombs, like chickens inside eggs. We could find ayys who are in the same situation as us; being on a planet orbiting a "main sequence star", but for such a situation occur a very specific set of events must take place first, which makes it very unlikely for two such planets to ever detect each other.
To help get your mind out of the gutter,
See:
https://youtu.be/mINsiT70OHE?t=1h12m52sAnd more in-depth:
https://youtu.be/Kff_ytg0-8w?t=7m31s 
